The secular trend of intelligence test scores: The Danish experience for young men born between 1940 and 2000.

ABSTRACT: The present study investigated the Danish secular trend of intelligence test scores among young men born between 1940 and 2000, as well as the possible associations of birth cohort changes in family size, nutrition, education, and intelligence test score variability with the increasing secular trend. The study population included all men born from 1940 to 2000 who appeared before a draft board before 2020 (N = 1,556,770). At the mandatory draft board examination, the approximately 19-year-old men underwent a medical examination and an intelligence test. In the statistical analyses, the IQ mean and standard deviation (SD) were estimated separately for each of the included annual birth cohorts based on information from birth cohorts with available total intelligence test scores for all teste

SUBMITTER: Hegelund ER 

PROVIDER: S-EPMC8659667 | biostudies-literature | 2021

REPOSITORIES: biostudies-literature